package com.tiemeng.mall.product.service.impl;

import org.springframework.stereotype.Service;

import java.util.Comparator;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.tiemeng.common.utils.PageUtils;
import com.tiemeng.common.utils.Query;

import com.tiemeng.mall.product.dao.CategoryDao;
import com.tiemeng.mall.product.entity.CategoryEntity;
import com.tiemeng.mall.product.service.CategoryService;


@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService {

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page = this.page(
                new Query<CategoryEntity>().getPage(params),
                new QueryWrapper<CategoryEntity>()
        );

        return new PageUtils(page);
    }

    @Override
    public List<CategoryEntity> listWithTree() {
        //获取所有的分类
        final List<CategoryEntity> categoryEntities = baseMapper.selectList(null);
        return categoryEntities.stream().filter(categoryEntity -> categoryEntity.getParentCid() == 0).map(menu->{
            menu.setChildren(getChildren(menu,categoryEntities));
            return menu;
        }).sorted(Comparator.comparingInt(menu -> (menu.getSort() == null ? 0 : menu.getSort()))).collect(Collectors.toList());
    }
    private  List<CategoryEntity> getChildren(CategoryEntity root,List<CategoryEntity> all){
        return all.stream().filter(categoryEntity -> categoryEntity.getParentCid() == root.getCatId()).map(categoryEntity -> {categoryEntity.setChildren(getChildren(categoryEntity,all));return categoryEntity;}).sorted(Comparator.comparingInt(menu -> (menu.getSort() == null ? 0 : menu.getSort()))).collect(Collectors.toList());
    }
}